package cn.chiship.framework.business.core.config;

import cn.chiship.framework.common.config.VisiableThreadPoolTaskExecutorConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * 线程池配置类
 *
 * @author lijian
 */
@Configuration
public class ThreadPoolExecutorConfig {

	private static final Logger LOGGER = LoggerFactory.getLogger(ThreadPoolExecutorConfig.class);

	/**
	 * 获得Java虚拟机可用的处理器个数 + 1
	 */
	private static final int THREADS = Runtime.getRuntime().availableProcessors() + 1;

	private int corePoolSize = THREADS;

	private int maxPoolSize = 2 * THREADS;

	private int queueCapacity = 1024;

	private String namePrefix = "async-service-";

	/**
	 * 异步线程池
	 * @return Executor 执行器
	 */
	@Bean("asyncServiceExecutor")
	public Executor asyncServiceExecutor() {
		LOGGER.info("start asyncServiceExecutor");
		ThreadPoolTaskExecutor executor = new VisiableThreadPoolTaskExecutorConfig();
		// 配置核心线程数
		executor.setCorePoolSize(corePoolSize);
		// 配置最大线程数
		executor.setMaxPoolSize(maxPoolSize);
		// 配置队列大小
		executor.setQueueCapacity(queueCapacity);
		// 配置线程池中的线程的名称前缀
		executor.setThreadNamePrefix(namePrefix);

		// rejection-policy：当pool已经达到max size的时候，如何处理新任务
		// CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
		executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
		// 执行初始化
		executor.initialize();
		return executor;
	}

}
